Title:
Respirator
United States Patent 2300273

Inventors:
Karl, Connell
Publication Date:
10/27/1942
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Assignee:
Air, Reduction
Primary Class:
128/205.170
Other Classes:
137/493, 128/205.140, 137/529, 128/205.240, 137/855, 137/542
International Classes:
A62B7/14; A62B7/00